tests: Add checks for ssh_key_is_private()
tests: Add checks for ssh_key_is_private()

Signed-off-by: Andreas Schneider <5be00ddc76278cf6077f5047ca3384a88460c671@cryptomilk.org>
(cherry picked from commit d54a1ab7981644b8d6f8e1ea58e5ba997f0b0cd6)

mwgoldsmith/libssh,mwgoldsmith/libssh,mwgoldsmith/libssh,mwgoldsmith/ssh,mwgoldsmith/ssh,mwgoldsmith/libssh,mwgoldsmith/ssh,mwgoldsmith/ssh